I just ran across this idea myself, but I guess it wasn't original. At any rate, I have a SketchUp file demonstrating this and some sample screen shots. [image: VZEM_sectionshadow-a.png] [image: n1ZL_sectionshadow-b.png] Shadows in Section Cut Seems it would be a pretty easy ruby script. User starts with section cut selected. Ruby copies all objects in active group to a new group. Changes materials Pastes section cut in place reverses section cut direction. If any geometry is changed the script has to be re-run.